ASHRAE 41.4

Abstract

This standard provides a method for measurement of proportion of lubricant in liquid refrigerant. <br>This standard <br>a. defines specialized terms, <br>b. specifies the required data and minimum precision, <br>c. specifies the methods of computation that should be used, and <br>d. describes the equipment required. <br>This standard is intended to apply only where it is known, or possible to determine, that the sample is of a miscible lubricant and liquid refrigerant mixture. This restriction is not intended to prevent the application of this standard to determine lubricant concentration in cases where lubricant immiscibility exists provided that the sample is confined entirely to either the lubricant-rich or refrigerant-rich layer. <br>This standard does not apply to measurement of lubricant concentrations when the total amount of lubricant collected is less than .001 g. <br>This standard provides for a primary (gravimetric) method but does not prohibit the use of other methods using new technologies, provided these methods are calibrated against the primary method. <br><strong>PURPOSE</strong> <br>This standard sets forth standard procedures for experimentally determining the weight concentration of miscible lubricant-and-liquid-refrigerant mixtures and, in limited cases, immiscible mixtures.